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a = 2
b = - 4
c = 12
titk balik P(x,y) = P( -b/2a , D/ -4a)
x = - b/2a
x = 4/2(2) = 4/4 = 1
y = f(1)= 2.1² - 4.1 + 12
f(1)= 10
tik balik (x,y) = (1, 10)